You could very well destroy a W58 on a stock na 2J. But, if this is your daily driver it wont be so bad, as long as you baby it. Fuck, ive heard of stock 7m's grenading one of these drifting.

Also, 1500 for the transmission is ridiculous, ive seen them go for around the $700 range, and if you lurk the salvage yard for long enough you can probably find one. Or even ebay.